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Fare aggregators redirect the users to an airline, cruise, hotel, or car rental site or Online Travel Agent for the final purchase of a ticket. Aggregators' business models include getting feeds from major OTAs, then displaying to the users all of the results on one screen. The OTA then fulfills the ticket. Aggregators generate revenues through advertising and charging OTAs for referring clients. Examples of aggregate sites are Bravofly, Cheapflights, Dohop, Kayak.com, Mobissimo, Momondo, CheapOair, Ixigo.com, SideStep, Wego.com, Skyscanner, and Webjet. Kayak.com is unusual in linking to online travel agencies and hotel web sites alike, allowing the customer to choose whether to book directly on the hotel web site or through an online travel agency. Google Hotelfinder is an experiment that allows to find hotel prices with Google, but it does not offer to book hotels, merely to compare rates.
The difference between a "fare aggregator" and "metasearch engine" is unclear, though different terms may imply different levels of cooperation between the companies involved.
In 2008, Ryanair threatened to cancel all bookings made on Ryanair flights made through metasearch engines, but later allowed the sites to operate as long as they did not resell tickets or overload Ryanair's servers.
Travel bargain websites collect and publish bargain rates by advising consumers where to find them online (sometimes but not always through a direct link). Rather than providing detailed search tools, these sites generally focus on offering advertised specials, such as last-minute sales from travel suppliers eager to deplete unused inventory; therefore, these sites often work best for consumers who are flexible about destinations and other key itinerary components.